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A263029
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Numbers n such that A002322(n) + 1 is not a prime, where A002322 is Carmichael lambda.
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5
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25, 32, 50, 55, 75, 81, 96, 100, 110, 115, 119, 121, 128, 150, 153, 160, 162, 165, 176, 187, 200, 203, 209, 215, 220, 221, 224, 230, 235, 238, 242, 245, 253, 256, 261, 275, 287, 288, 289, 295, 297, 299, 300, 306, 319, 323, 324, 330, 335, 343, 345, 355
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OFFSET
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1,1
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COMMENTS
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Complement of A263028.
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LINKS
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Antti Karttunen, Table of n, a(n) for n = 1..25794
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MATHEMATICA
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Select[Range[1, 400], ! PrimeQ[CarmichaelLambda[#] + 1] &]
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PROG
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(MAGMA) [n: n in [2..400] | not IsPrime(CarmichaelLambda(n)+1)];
(PARI) for(n=1, 1e3, if(isprime((1 + lcm(znstar(n)[2]))) == 0, print1(n", "))) \\ Altug Alkan, Oct 12 2015
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CROSSREFS
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Cf. A002322, A263027, A263028.
Positions of zeros in A296077.
Cf. also A039689.
Sequence in context: A172007 A107258 A258876 * A225418 A035140 A050694
Adjacent sequences: A263026 A263027 A263028 * A263030 A263031 A263032
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KEYWORD
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nonn,easy
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AUTHOR
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Vincenzo Librandi, Oct 12 2015
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STATUS
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approved
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